The CO detector is an "Aithre Shield EX 2.0". It has three wires, red (+5V power), white (CO signal out) & black (ground). Power is supplied from the GEA24.
Red wire to GEA24 J244 pin 30 (POS 5 HI / +5V) White wire to GEA24 J244 pin 31 (POS 5 / MISC PRESS) Black wire to GEA24 J244 pin 32 (POS 5 LO / GND)
Set GEA Input Configuration: Pos 5 / GP 5 / Misc Press: Custom Analog 5 Gauge Name - CO PPM EIS Display - Auto Display Range - 0.0 - 255.0 Green Range - 0.0 - 10.0 Yellow Range + Alert - 10.0 - 50.0 Red Range + Alert - 50.0 - 255.0 Calibration: 0.000V = 0.000 > 3.300V = 255.000
